Perl
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In 1987, Perl 1.0 changed the world. In the decades since then, the language has grown from a simple tool for system administration somewhere between shell scripting and C programming to a powerful, general purpose language steeped in a rich heritage. Even so, most Perl 5 programs in the world take far too little advantage of the language. You can write Perl 5 programs as if they were Perl 4 programs (or Perl 3 or 2 or 1), but programs written to take advantage of everything amazing the worldwide Perl 5 community has invented, polished, and discovered are shorter, faster, more powerful, and easier to maintain than their alternatives.
Modern Perl 2011-2012 edition by chromatic | Onyx Neon Press
You write code for a living, and your inherit a legacy program written in Perl. You can program in your native language in your sleep. But you don't know Perl at all, or you've only dabbled with it. Your deadline doesn't give you enough time to rewrite the legacy program in your native language, but it needs new features. You need to learn Perl, and you need to learn it NOW.
Impatient Perl (free) - www.perl.org
Higher-Order Perl
Current Status: The book was published on 8 March 2005. Copies are now available in bookstores in the U.S. and Europe, and from online booksellers. A second printing became available in August 2005. Idea of the Book Higher-Order Perl is about functional programming techniques in Perl. It's about how to write functions that can modify and manufacture other functions.
